Microstructural Evolution and Mechanical Properties of a High-Strength Low Alloy Steel Produced by Wire Arc Additive Manufacturing

  • Program
  • Room 2E East
  • September 12 2018
  • 2:00 pm - 2:25 pm

Owing to great deposition rate, low material and equipment expenses, and satisfying structural integrity, recently developed Wire Arc Additive Manufacturing (WAAM) technology is a proper competitor for replacing conventional methods of manufacturing. In this process, a consumable filler wire is fed at a controlled rate into an electric arc to deposit material layer by layer to form fully dense and functional component. In this study, ER70S high-strength low alloy (HSLA) steel wall was fabricated using a gas metal arc welding (GMAW) torch translated by a six axis robotic arm and employing advanced surface tension transfer (STT) mode. Microstructural analysis of the fabricated part was performed through using optical microscopy (OM), field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and electron backscatter diffraction (EBSD) on planes parallel as well as perpendicular to the building directions to investigate microstructural anisotropy of the component. A comprehensive study of the mechanical properties of the fabricated part at different orientations relative to the building direction utilizing micro-hardness testing, uniaxial tensile testing, followed by fractography of the fractured surfaces was also performed.